The Bureau of Internal Revenue (BIR) announced that taxpayers may refuse tax audit requests that are outside the scope and limits stated in official audit instruments such as Letters of Authority (LOAs) and Mission Orders (MOs).
This clarification is part of Revenue Memorandum Order (RMO) No. 1-2026, which was explained by BIR Commissioner Charlie Mendoza during a Senate blue ribbon committee hearing. The new rules aim to clearly define how audit instruments should be used and what authority they provide.
Quick Summary
- Taxpayers may refuse requests not covered by audit instruments.
- RMO No. 1-2026 clarifies the proper use of LOA, MO, and Tax Verification Notice.
- Mandatory labels now define the limits of audit authority.
- The Single-Instance Audit Framework limits examinations to one LOA per taxpayer per year.
- Audit selection follows a risk-based and system-assisted process.
- Audit assignments are anonymized until completed.
- All audit-related task forces have been dissolved.
- The BIR acknowledges that consistent implementation remains a key challenge.
What the New Rules Clarify
According to Commissioner Mendoza, the new rules establish clear boundaries through mandatory labels on audit instruments. These labels inform taxpayers about the exact scope and limits of authority being exercised.
As explained during the hearing:
The Bureau provides taxpayers with explicit notice of the scope and limits of audit authority through mandatory labels on audit instruments.
He added that if a revenue officer asks for something outside what is stated in the audit instrument, the taxpayer has the right to refuse. This measure is intended to protect due process and ensure that the extent of audit authority is disclosed from the beginning.
Single-Instance Audit Framework
One of the major reforms introduced is the Single-Instance Audit Framework.
Under this framework:
- Examinations are limited to one LOA per taxpayer per year.
- Simultaneous audits will no longer take place.
- Compliance becomes more organized because only one audit and one submission of requirements are involved for a given year.
Risk-Based and System-Assisted Audit Selection
The BIR also adopted a risk-based and system-assisted method for selecting audit cases.
Key points include:
- Only taxpayers identified using anonymized, system-generated risk criteria may undergo regular audit.
- Audit assignments are anonymized during the assignment process.
- The identity of the taxpayer remains concealed until assignments are finalized.
According to the BIR chief, this approach aims to eliminate the perception of a “suki system,” where the same taxpayers are repeatedly selected.
Strengthening Due Process and Public Trust
Mendoza explained that anonymized assignments are intended to:
- Reduce opportunities for harassment or undue influence
- Strengthen due process
- Increase public trust in a system that is data-driven and risk-based
Changes in Audit Structure
All audit-related task forces have been dissolved. Their assessment functions have been returned to regular BIR offices where supervision and accountability are clearly defined.
Background on the Audit Reform
In November, the BIR suspended field audits and related operations following complaints regarding audit instruments such as LOAs and MOs.
The updated rules were introduced to address these concerns and improve how audit processes are handled moving forward.
Implementation as the Next Challenge
While presenting the reforms, Mendoza acknowledged that the bigger challenge lies in actual implementation.
He emphasized that revenue regions and units in the national office must apply the rules consistently and avoid unnecessary discretion. The BIR’s focus in the coming days will be ensuring that implementation follows the intended guidelines.
Key Takeaways
- Taxpayers may refuse requests outside the stated scope of audit instruments
- RMO No. 1-2026 clarifies the use of LOA, MO, and Tax Verification Notice
- A single-instance audit system limits audits to one LOA per year
- Audit selection now follows anonymized and risk-based criteria
- Audit task forces have been dissolved and functions returned to regular offices
- Consistent implementation remains the main challenge ahead
Conclusion
The BIR’s updated audit rules under RMO No. 1-2026 introduce clearer limits on audit authority and reinforce due process for taxpayers. By defining the scope of audit instruments and adopting a system-based selection process, the agency aims to make audits more structured and transparent.
As emphasized during the Senate hearing, the next focus will be ensuring consistent implementation of these reforms across all revenue regions.
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